Table 1

Summary data for daily asthma admissions, meteorological, and air pollution variables

Variable		Days of observations		Mean		SD		Percentile
Variable		Days of observations		Mean		SD		Min	5th	10th	25th	50th	75th	90th	95th	Max
Asthma admissions/day
All ages	1796	35.1	15.3	3	15	18	24	33	43	54	64	109
0–14 years	1796	19.5	11.1	1	6	8	12	17	25	34	40	85
15–64 years	1796	13.1	6.3	1	5	6	9	12	17	21	25	46
65+ years	1796	2.6	1.8	1	1	1	1	2	3	5	6	12
Mean temperature (°C)	1796	12.3	5.2	−5	4	6	8	12	16	20	21	29
Relative humidity (%)	1796	72.1	10.2	40	54	58	65	72	80	86	89	96
O₃, maximum 8 h average (ppb)	1613	15.5	10.9	1	2	4	8	14	21	28	36	74
O₃, maximum 1 h (ppb)	1677	20.6	13.2	0	3	5	11	20	27	36	45	94
NO₂, 24 h average (ppb)	1782	37.2	12.3	14	22	25	30	36	42	50	58	182
NO₂, maximum 1 h average (ppb)	1782	57.2	23.0	21	35	38	44	52	64	81	98	370
Black smoke, 24 h average (μg/m³)	1793	14.6	7.0	3	7	8	10	13	18	22	26	95
SO₂, 24 h average (μg/m³)	1793	32.0	11.7	9	16	18	24	31	38	46	52	100
Birch pollen (grains/m³)^1-1	252/915	18	42	1	1	1	1	3	18	40	94	406
Grass pollen (grains/³)^1-1	600/915	21	37	1	1	1	2	6	18	68	104	293
Oak pollen (grains/m³)^1-1	207/915	14	28	1	1	1	1	3	13	41	73	213